Processed
Barley Koji
A tier
Barley koji grows A. oryzae on steamed hulled or pearled barley, giving a nuttier, more rustic enzyme cake than rice koji. Mugi miso and some shoyu-adjacent ferments depend on that grainy depth. The enzymes still sweeten and savour, but the finished miso is darker and more cereal than a rice-koji white miso. Barley husk left on can taste rough; most makers use pearled grain. Incubation looks like rice koji but the grains are oval and tan under the white felt. Do not swap it 1:1 into a sake rice bill. Dried barley koji exists for home mugi miso when fresh is out of reach.
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Characteristics
Preparations
Traits
History
Regional Japanese miso makers grew koji on barley where rice was dear.
Mugi miso styles fixed barley koji as a named household ferment.
Industrial miso plants kept barley koji lines beside rice koji.
Craft miso in the West adopted barley koji for darker, cereal-forward pots.